Strong Base Anion/Hydroxide Form Resin

TULSION A-33 from Thermax is a premium, nuclear-grade Type I strong base anion exchange resin supplied in the hydroxide form. Built on a crack-free polystyrene matrix with quaternary ammonium Type I functional groups, it offers the physical and chemical stability needed for the most demanding high-purity water applications, with no more than 3% of exchange sites left in the chloride form after regeneration. That tight ionic-form control is critical in service where even trace contamination can compromise an entire treatment train.

Primary applications

This strong base anion resin is used chiefly to purify reactor coolant water and moderator in nuclear power stations, where keeping corrosion products to an absolute minimum protects heat-transfer surfaces from scaling and corrosion. Its consistency and purity also make it well suited to other ultrapure water duties that require strict control of ionic and metallic contamination, such as high-pressure boiler feed and demineralization polishing.

• Type I strong base anion resin on a polystyrene matrix
• Quaternary ammonium Type I functional groups
• Supplied in hydroxide (OH) form, under 3% chloride form
• Crack-free beads with excellent physical and chemical stability
• Excellent capacity for boric acid removal
• Manufactured under stringent controls for minimal metallic impurities

A standout characteristic of A-33 is its strong capacity for removing boric acid, an important factor in nuclear coolant chemistry where boron management is part of normal operation. Because the resin is produced under exacting quality controls, it delivers very low metallic impurity levels and the highest purity of ionic form, qualities that matter enormously when a single contaminant source can foul sensitive surfaces.

In a typical demineralizer, a strong base anion resin like A-33 works downstream of a strong acid cation resin to capture the anions left behind, and it is also used in mixed-bed polishers for final cleanup. Proper regeneration with sodium hydroxide restores capacity and maintains the resin's low-chloride, high-purity performance through repeated service cycles. For water-treatment professionals specifying ion exchange media for nuclear-grade or ultrapure service, TULSION A-33 represents a proven, high-reliability choice.

When loading or replacing the bed, technicians should follow proper handling and rinse procedures to preserve the resin's high-purity ionic form, since contamination during installation can undermine the very low impurity levels the media is designed to deliver. For demineralizer and mixed-bed systems where ultrapure output is non-negotiable, TULSION A-33 supplies the reliable, low-chloride anion exchange capacity that high-purity water programs depend on.